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    SubjectRe: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority
    On Thu, 2 Oct 2008 13:24:57 -0700
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > Of course, that could all be wrong and we could be stuck somewhere
    > else. A good way to diagnose this stuff would be
    >
    > --- a/kernel/sched.c~a
    > +++ a/kernel/sched.c
    > @@ -5567,10 +5567,14 @@ EXPORT_SYMBOL(yield);
    > void __sched io_schedule(void)
    > {
    > struct rq *rq = &__raw_get_cpu_var(runqueues);
    > + unsigned long in, out;
    >
    > delayacct_blkio_start();
    > atomic_inc(&rq->nr_iowait);
    > + in = jiffies;
    > schedule();
    > + out = jiffies;
    > + WARN_ON(time_after(out, in + 1 * HZ));
    > atomic_dec(&rq->nr_iowait);
    > delayacct_blkio_end();
    > }
    > _
    >
    > perhaps for varying values of "1".

    I'll run with this. (well with a value of "1000" for 1 ;-)

    Also I'll tell latencytop to give me the full backtrace as well ;-)


    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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